CN100397510C - Optical pickup with dual focal length - Google Patents
Optical pickup with dual focal length Download PDFInfo
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- CN100397510C CN100397510C CNB2006100063222A CN200610006322A CN100397510C CN 100397510 C CN100397510 C CN 100397510C CN B2006100063222 A CNB2006100063222 A CN B2006100063222A CN 200610006322 A CN200610006322 A CN 200610006322A CN 100397510 C CN100397510 C CN 100397510C
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
- G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/082—Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head
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- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
An optical pickup has a light source for generating a laser light, an objective lens for condensing the laser light to form a light spot so as to irradiate an optical disk formed of a substrate and having a pair of major surfaces spaced from each other by a thickness of the substrate and a recording face interposed between the major surfaces, and an actuator for moving the objective lens in a direction of the thickness of the optical disk within a total movable range so as to focus the light spot on either one of the recording face and the major surface. The total movable range of the objective lens is set to be equal to or more than a sum of an allowance range and an additional range. The allowance range is set to allow the objective lens to keep a constant distance between the objective lens and the recording face even when a level of the optical disk varies in the direction of the thickness. The additional range is set by dividing a gap between the major surface and the recording face of the optical disk by an absolute refraction index of the substrate of the optical disk.
Description
Technical field
The present invention relates on a kind of recording surface that is radiated at the CD internal layer and the optical pickup of the laser that focuses on the front surface of CD and the optical disk recording device of this optical pickup has been installed.
Background technology
Now developed the dedicated printer that on the labeled surface of CD, to print the information that needs.By using special-purpose print cartridge, this printer not only can be used for type information on the paper and also can labeled surface at CD on type information.In addition, some CDs have the general labeling face of not writing brand name on it.After printing, make black stable coating be applied to this CD immediately with a kind of.
The user can adopt the visual information that above-mentioned CD and printer are printed to be needed the content information of the data that write down on about CD on the labeled surface of CD.Therefore, the content that the user at any time just can discern on the CD to be write down by inspection the information clearly on this labeled surface of being printed at an easy rate, and need not on reproducer, to play CD.
Yet, by optical disk recording device with after data recording is to the CD, CD can be taken out and be placed in the above-mentioned printer.This processing has brought a problem, promptly should operate pretty troublesome for the user.
Therefore, the equipment of a kind of integrated printer and optical disk recording device has been proposed, this equipment not only with data recording to the recording surface of CD, and can on the index face of the CD of record data, print the information that needs.
Yet owing to printer and the as above integrated configuration of optical disk recording device make this equipment bigger than general optical disk recording device size, therefore the problem that exists of this record and printing device is the complicated and price height of configuration.Another problem is if printer adopts the method for ink-jet, safeguards trouble owing to need additional ink to make, and need clean the nozzle of ejection ink when printer uses a very long time.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of not only with data recording to the recording surface of CD and also can on the index face of CD, form needs image optical pickup and the optical disk recording device of this optical pickup has been installed.
As the device that addresses the above problem, the present invention includes following ingredient.
(1) a kind of optical pickup, wherein by the thickness direction of CD movably object lens laser beam is focused on, thereby the light of focusing is applied on the CD, it is characterized in that
When laser focusing is on the recording surface of CD internal layer, even CD fluctuates up and down, total object lens moving range be set to be equal to or greater than object lens are moved so that keep between object lens and the recording surface constant distance range of tolerable variance and by the additional range that obtains divided by the absolute index of refraction of compact disc substrate from the substrate surface of CD to the distance the record surface and.
According to the present invention, optical pickup is used for the record surface identifying recording layer at CD.In addition, under the situation that the record surface side and the index face side of CD is placed upside down, also can on index face, form required image with optical pickup with the CD of special coating coating.When CD is placed upside down, will from the laser focusing [1] of optical pickup irradiation on the record surface of CD internal layer and focusing [2] on index face.In the present invention, under [1] and [2] two kinds of situations, mobile range is set, so that optical pickup easily carries out focus servo control.
Therefore, the mobile range of the object lens in the optical pickup of the present invention is constructed as follows.The first, it is identical with [2] two kinds of situations to the level fluctuation of handling CD that this mobile range is set in [1].Because even the surface of CD is placed upside down, the horizontal wave momentum of CD is also identical, so this is possible.
Secondly, for the situation of [2], the additional range that will be obtained divided by the absolute index of refraction of the substrate of CD by the record surface and the distance between the substrate surface of CD is added on the mobile range of [1].This distance is substantially equal to the distance between the another location of the position of the object lens on the record surface of CD internal layer time the with laser focusing and the object lens when on the index face of the CD that laser focusing is placed upside down on the surface of CD.Total mobile range of object lens be set to be equal to or greater than mobile range that the level fluctuation for CD is provided with and for a change the mobile range that is provided with of the focal position of laser with.Like this, object lens can be from the another location when the position on the record surface of CD internal layer the time moves on the index face of laser focusing at CD with laser focusing.
As mentioned above, adopt optical pickup of the present invention, consider that the level variation on surface is recorded in data on the record surface of CD.In addition, under the situation that record surface and index face with CD are placed upside down, also can adopt this optical pickup when irradiating laser the time, to use to form on the index face of CD of special coating of color to form required image.
(2) to be object lens with laser assemble so that the position that focuses on the record surface at the internal layer of CD when first basic point, to be object lens with laser assemble so that during the another location that focuses on the substrate surface of CD or index face with second basic point, approximately identical with outside mobile range from the object lens of second basic point of a side relative with CD from the inside mobile range of the object lens of first basic point of a side of CD.
When CD surperficial mobile, the horizontal wave momentum of CD or roughly to be positioned at first basic point identical or roughly to be positioned at second basic point identical with object lens with object lens.Therefore, no matter which position object lens are arranged on, can both handle the level fluctuation of CD by identical mobile range is set.Therefore, can be on the moving recording face of CD inboard with laser focusing, and also can be with laser focusing on the front surface that moves of CD.
(3) optical recording apparatus provides the optical pickup described in (2) in this equipment, and focus servo mechanism controls optical pickup is so that optical pickup is carried out focus servo in one of zone of extending from first basic point and second basic point.The zone that provides the importation to be used to select to carry out focus servo, and provide control section to be used for the zone that focus servo mechanism carries out focus servo being set according to input content from the importation.
In this configuration, when the user from importation input during one of from zone that two differences extend, control section is provided with this zone and carries out the focus servo that is used for focus servo mechanism.By this way, optical pickup can execution focuses in the setting area under the control of focus servo mechanism.
(4) when selecting from zone that second basic point extends as depth of focus zone by the importation, control section makes optical pickup according to the laser radiation patterned illumination laser that is used for forming image on the index face of CD.
When the user selects to assemble the zone that extend the position of the laser that will focus at the front surface of CD from object lens, when being used for optical disk recording device and carrying out focus servo regional, it is possible carrying out servo-focus for the control section of optical disk recording device.In addition, make optical pickup come irradiating laser according to the laser radiation pattern that is used for formation image on index face.Therefore, the special coating that will form color when irradiating laser the time is applied under the situation of the recording type optical disc on the recording surface, can be set to towards optical pickup data are recorded on the record surface by record surface.In addition, can be set to image is formed on the index face by index face towards optical pickup.
Description of drawings
Fig. 1 represents the block scheme of the configuration of optical disk recording device according to an embodiment of the invention.
Fig. 2 (A) is the position relational view of representing between object lens and the CD to 2 (C).
Fig. 3 (A) and 3 (B) are illustrated respectively in image that polar coordinate system forms and at the diagrammatic sketch of the source images of rectangular coordinate system.
Fig. 4 is the image diagrammatic sketch that is converted into the image of polar coordinate system from rectangular coordinate system.
Fig. 5 is the process flow diagram that is used to describe the operation of optical disk recording device.
Fig. 6 (A) is the demonstration example of image generating program to 6 (D).
Fig. 7 is the block scheme of expression light pick-up header structure.
Embodiment
To optical pickup and optical disk recording device be described according to embodiments of the invention below.Fig. 1 is the configuration block scheme of expression according to the optical disk recording device of the embodiment of the invention.As shown in Figure 1, the optical disk recording device according to the embodiment of the invention has the configuration that CD drive 2 is connected to main frame 3.This CD drive 2 comprises and feeds motor 8, guide rail 9, optical pickup 10, spindle motor 11, RF amplifier 12, servo circuit 13, address detection circuit 14, demoder 15, control section 16, scrambler 17, strategy circuit 18, laser driver 19, laser power control circuit 20, frequency generator 21, envelope detected circuit 22, β testing circuit 24, storage area 25, memory buffer 26 and laser radiation pattern transfer circuit 27.Main frame 3 comprises display part 4, importation 5, main memory portion 6 and main control part 7.
Feed motor 8 and provide the motor that makes the driving force that optical pickup 10 moves radially along CD D.
The EFM-modulated RF signal that is provided by optical pickup 10 is provided for RF amplifier 12, so that the RF signal that output has been amplified is to servo circuit 13, address detection circuit 14, envelope detected circuit 22, β testing circuit 24 and demoder 15.
At reproduction period, the RF signal that EFM-that demoder 15EFM-demodulation is provided by RF amplifier 12 has modulated reproduces data so that produce, and it is outputed to data storage circuitry 25.During data recording, when coming by test record to reproduce from the zone of record data, the RF signal that demoder 15EFM-demodulation is provided by RF amplifier 12.
The swinging signal component from the EFM signal that is provided by RF amplifier 12 is provided address detection circuit 14, and decoding be included in the position in this swinging signal component temporal information (address information), be used to discern the identifying information (ID of dish) of CD D and for example indicating panel kinds of information such as coating on the CD D, then they are outputed to control section 16.In addition, also will be included in the position in the swinging signal component temporal information (address information), be used for discerning the identifying information (ID of dish) of CD D and be called ATIP (in the absolute time of preset-groove) as the indicating panel kinds of information such as coating on the CD D.
When carrying out in the zone of the test record of CD D when reproducing, β testing circuit 24 calculates β (asymmetric) as the parameter from the quality level of the reproducing signal of RF signal about being provided by RF amplifier 12, and exports this result of calculation to control section 16.Here, can be by β=(a+b)/(a-b) obtain β, wherein a is that the crest level (symbol be+) of EFM-modulation signal waveform and b are trough level (symbols be-).
Before test record was applied to CD D, envelope detected circuit 22 detected the envelope of EFM signal in the numeration zone of above-mentioned CD D, partly began to carry out test record so that detect which of the test zone of CD D.
Here, during writing down, optical disk recording device 1 can be changed between CLV (constant linear velocity) method that CAV (Constant Angular Velocity) method that CD D drives with Constant Angular Velocity and CD D drive with constant linear velocity according to an embodiment of the invention.Therefore, servo circuit 13 is changed between CAV method and CLV method according to the control signal that is provided by control section 16.Under the situation of CAV control, servo circuit 13 control spindle motors 11 are so that the rotational speed of the spindle motor that is detected by frequency generator 21 is corresponding with the rotational speed of setting.Under the situation of CLV control, servo circuit 13 control spindle motors 11 are so that the swinging signal component in the signal that is provided by RF amplifier 12 equates with the linear velocity ratio of setting.
Scrambler 17EFM-modulates the record data by 7 outputs of main control part, and it is outputed to strategy circuit 18.18 pairs of strategy circuit output to laser driver 19 from EFM signal application time shaft treatment for correcting of scrambler 17 etc. and with it.The signal that the record data that laser driver 19 response bases are provided by strategy circuit 18 are modulated and the control signal of laser power control circuit 20 drive the laser diode of optical pickup 10.
The power of the laser that the laser diode of laser power control circuit 20 control optical pickups 10 sends.More specifically, laser power control circuit 20 is controlled laser driver 19 according to the information of the desired value of the optimal laser power that is sent from control section 16 by the current value of the monitoring diode output of optical pickup 10 and expression, so that laser pickup 10 irradiation have the laser of optimal laser power.
For example, storage area 25 is stored by testing the data of acquisition and the firmware of optical disk recording device 1 in advance.
For example, the display part 4 of main frame 3 shows the signal quality level and the information that will send to the user from optical disk recording device 1 of the data that write down among the CD D.The user adopts importation 5 to carry out various controls and optical disk recording device 1 is operated.Main memory portion 6 storages are used to carry out the program and the image recording data that are used for the information of document image on the labeled surface of CD about the data processing of the image on the labeled surface that is recorded in CD D by CD drive 2.Each part of main control part 7 control optical disk recording devices is so that record, inspection and reproduction data and document image.
Next, will the detailed configuration and the operation of optical pickup 10 be described.Fig. 2 (A), 2 (B) and 2 (C) are the diagrammatic sketch of the position relation between expression object lens and the CD.The optical pickup 10 of optical disk recording device 1 of the present invention can be selected one and finish focus servo from the zone that two differences extend.More particularly, shown in Fig. 2 (B), when laser focusing is on the record surface of CD D, the object lens 31 of aggregation laser is moved around the position 41 of object lens 31 (below be called first basic point) thereby along the thickness direction of CD realize focus servo.In addition, shown in Fig. 2 (C), when the front surface of laser focusing at CD D, the object lens 31 of aggregation laser move around the position 42 of object lens 31 (below be called second basic point) thereby along the thickness direction of CD and realize focus servo.In addition, consider the level fluctuation of when rotation CD D and crooked, will from the focal zone 51 of first basic point (below be called the first area) be set to have approximately identical distance (scope) from the focal zone 52 of second basic point (below be called second area).For example, in the example shown in Fig. 2 (A)-2 (C), first area 51 and second area 52 are set to ± 0.8mm.
In addition, by the predetermined input from the importation 5 of main frame 3, optical pickup 10 can rely on focus servo mechanism that the position of object lens 31 is moved to first basic point 41 and second basic point 42.
Therefore, total moving range of the object lens 31 of optical pickup 10 is set to be equal to or greater than the distance (scope) of the CD side of first area 51, the summation of the distance that obtains divided by the absolute index of refraction (=1.584) of polycarbonate in distance second area 52 and the CD opposite side (scope) with by the record surface and the distance between the polycarbonate substrate surface of CD.In addition, the distance that is obtained divided by the absolute index of refraction (=1.584) of polycarbonate by the record surface and the distance between the polycarbonate substrate surface of CD is with the airborne optical path length from the conversion of the optical path length in the compact disc substrate, and laser is transferred to record surface by this optical path length from the front surface of CD.In example shown in Figure 2, the distance (scope) of the distance (scope) on the CD side in the first area 51, the side that the CD in the second area 52 is relative all is 0.8mm.In addition, the length that is obtained divided by the absolute index of refraction (=1.584) of polycarbonate by the record surface and the length between the polycarbonate substrate surface of CD approximately is 0.76mm.Therefore, total moving range of object lens 31 approximately is 2.4mm (≈ 2.36mm).
In addition, the distance (scope) of the CD side in the first area 51 is set even make when be driven in rotation, the surface level variation of CD, object lens 31 do not contact with the front surface of CD yet.
In addition, shown in Fig. 2 (A), when first basic point 41 was the initial position (being also referred to as center or neutral position) of the object lens 31 of optical pickup 10,2 times of being set to greater than the moving range of CD D side of the moving range of the deviser of optical disk recording device 1 and the object lens 31 of CD D opposite side were preferable.Therefore, optical pickup 10 of the present invention is newly-designed, but by revise only specify the first area as moving range so that make the design of the ordinary optical pick-up head that the mobile range of the direction of relative CD prolongs can easily obtain optical pickup of the present invention.
51 execution focusing form pit by the record surface that laser is applied to the internal layer of the CD identical with normal optical disk thereby optical pickup 10 of the present invention is in the first area, thereby finish the record of desired data.In addition, optical pickup 10 of the present invention is carried out at second area 52 and is focused on, then laser is used the mark layer of the front surface of CD, this is that traditional optical pickup can not obtain, thereby can form the image of expression information needed on the index face of the CD of application specific coating.Can form this images such as character, symbol, picture or photo relevant as required information with recorded data among the CD D.Certainly, also can form with CD D in the image of the irrelevant information that write down.
Here, be applied to the reflected light of reflected light than the laser that is applied to record surface of laser of index face by optical pickup 10 a little less than.This be because, for example, under the situation of CD-R, record surface have the reflection horizon (for example gold, silver or aluminium) that forms by metal than lower floor's (organic dye layer), but index face does not have this reflection horizon.Therefore, when optical disk recording device 1 carry out to focus on the index face that laser is applied to CD at second area, increasing the light-receiving gain is necessary so that do not produce focusing error.In other words, AGC (automatic gain control) about optical disk recording device, make the setting range of AGC be provided with broad, make when carrying out in the first area when focusing on and can adjusting this gain when focusing on and can change this configuration that gains so that provide according to the zone of carrying out focusing when carrying out at second area.
In order on the index face of CD D, to form image, adopt to be applied to special coating as mentioned above that the CD of index face is necessary by optical disk recording device 1 of the present invention.For example, these materials that are used as this special coating can be to have photosensitive photosensitizer and form color when irradiating laser, contract formation that coating flows out during also when irradiating laser of heat sensitive heat sensitizing agent and formation color or its capsule melt together along with LASER HEAT when the irradiating laser minute-pressure is included in the color of the coating in the capsule.The user of optical disk recording device 1 of the present invention can adopt this CD to come to form the image of the required information of expression on the index face of CD.
Next, the operation that image will be formed on the optical disk recording device of the present invention 1 on the index face of CD is described.Fig. 3 be the expression rectangular coordinate system source images diagrammatic sketch and be used for the source images of the polar coordinate system that image forms.When rotary CD, optical disk recording device 1 is used for the laser of record data in the record surface of CD from optical pickup 10 irradiations, thereby forms image on the index face of CD D.Therefore, shown in Fig. 3 (A), will form the laser radiation pattern of image on CD D as being used for, optical disk recording device 1 adopts an image according to the image in the polar coordinate system.
Here, shown in Fig. 3 (B), be image generally in rectangular coordinate system by the image of processing such as computing machine, rather than at the image of polar coordinate system.Therefore, optical disk recording device 1 is the image of polar coordinate system with the image transitions of rectangular coordinate system, and when rotary CD, on the basis of the image (image formation data) of polar coordinate system, use laser, thereby produce the data that the laser radiation pattern data that is used to form image connects continuously (below be called serial data).According to these serial datas, from appointed positions image is formed on the index face of CD D so that opening entry (R
0, θ
0).
For example, be that optical disk recording device 1 produces images in main control part 7 and forms data on the basis of view data of bmp (bitmap) form of example in view data with rectangular coordinate system.Fig. 4 is image is converted to the image of polar coordinate system by rectangular coordinate system an image diagrammatic sketch.At first, for can be when forming image, adjust the intensity of the irradiation power of laser, and dithering process is applied to image with bitmap format according to gray shade scale with predetermined gray scale representation.Dithering process is a kind of method of representing color depth by the distribution and the density of change point.Next, will place on the polar coordinates with the image through dithering process of bitmap format, determine wherein more selectable so that the view data of bitmap format is converted to the view data of polar coordinate system.In other words, as shown in Figure 4 with the right angle, bottom of the image of rectangular coordinate system (x, y)=(X
0, Y
0) as reference point, according to equation conversion image data as follows:
In addition, the view data under the polar coordinate system is converted to serial data, so that adopt optical disk recording device 1 to form image by laser is applied to CD.On the basis of the serial data that produces, optical disk recording device 1 is applied to appointed positions with laser and comes opening entry, thereby forms image on the index face of CD.
In addition, in CD drive 2, optical pickup 10 is bigger than the spacing (1.6 μ m) of the preset-groove that forms on the index face of CD along the amount of feeding (for example 8 μ m) of disc radial direction for the CD index face, form image if shine with this amount of feeding, the PEL (picture element) density that is formed on the index face reduces.Therefore, in optical disk recording device 1, optical pickup is at predetermined period or at radially the swing amplitude to be scheduled to of each period of change along CD, so that laser is applied to the identical circumference of repeatedly counting.Like this, owing to laser can be applied to the diverse location of same circumference, the image density that is formed on the index face improves.
Next, the operation of optical disk recording device of the present invention will be described according to process flow diagram.Fig. 5 is the process flow diagram that is used to describe the operation of optical disk recording device.When forming image on the index face at CD, the user at first is provided with the image that will form by optical disk recording device 1 on index face, and the image generating routine that is installed on the main frame 3 by employing forms required image.In following steps, produce image and form data.The demonstration example of Fig. 6 presentation video generating routine.At first, the user selects the icon 61 of image generating routine shown on the display part 4 of the optical disk recording device 1 shown in Fig. 6 (A), thus the carries out image generating routine begin the operation.Detect this operation, the main control part 7 of optical disk recording device 1 reads and starts the image generating routine (s1) that is stored in the main memory portion 6.Shown in Fig. 6 (B), main control part 7 makes display part 4 display reminding users that character, picture pictures 62 (s2) such as (view data in the rectangular coordinate system) selectable, that will form as image on CD are set.Shown in Fig. 6 (C), according to picture, images 63 such as selectable character that user's setting for example will be write down as image on CD or picture.At this moment, the user can be from the importation 5 input optical characters, perhaps start other image and produce software and produce selective image and use this image.Further, can read character data or view data in the storage area 6 that is stored in main frame 3.Further again, can obtain character data or view data from the network address on the Internet.
Shown in Fig. 6 (D), when source images 63 is set (s3), optical disk recording device 1 makes display part 4 show that view data with set bmp form is superimposed upon the image 64 (s4) on the image of CD.Main control unit 7 makes display part 4 display images 65 so that whether the inquiry user wants edited image (s5).When the image after the formation of satisfying demonstration on display part 4, the user is chosen in the decision button that shows on the display part 4, forms data thereby control optical disk recording device 1 produces image.On the other hand, when the existing problems of the image after the formation that shows on display part 4, the user changes the size that image forms the position or adjusts image, thereby handles shown image (s6).When finishing adjustment, the user selects decision button, forms data thereby control optical disk recording device 1 produces image.
For example, when being controlled by the user when producing image and forming data, the view data of the rectangular coordinate system that the main control part 7 of optical disk recording device 1 will be provided with by the user is converted to the view data (s7) of polar coordinate system.On the basis of the view data of polar coordinate system, main control unit 7 produces irradiation so that form the serial data that the irradiation pattern data of the laser of image connect continuously on CD, and produces that image forms data and in the locational information (s8) that begins to form image by serial data.
After the generation that finishes image formation data, main control part 7 forms data transmission to CD drive 2 with image.In addition, main control part 7 makes display part 4 display reminding user CDs be set to form the picture (s9) of image on index face.After having confirmed this picture, the user is provided with CD with the CD index face towards the mode of optical pickup.
When detecting (s10) when being provided with CD, the main control part 7 of optical disk recording device 1 checks whether the index face of CDs is set to towards the CD pick-up head.In other words, main control part 7 makes control section 16 outputs be used for the object lens 31 of optical pickup 10 are moved to the signal of second basic point of servo circuit 13.According to this signal that receives, servo circuit 13 control focus servo mechanisms make object lens 31 move to second basic point, and focus servo mechanism are set so that finish focus servo at second area.The gain conversions of the agc circuit that main control part in addition, 7 will provide in the RF amplifier by control section 16 is for being suitable for second area (s11).Lower powered laser that will applied laser is identical when reproducing data is applied to the CD of being placed, thereby determines the preceding of CD and afterwards (s12) by receiving from catoptrical power.Because the record surface of CD is set to towards optical pickup when the reflected light of laser has than the big power of predetermined power, main control part 7 is overturn display part 4 display reminding users and is reapposed the content (s13) of CD.When detecting the user and overturn CD (s14), main control part 7 is carried out the processing of s12 once more.
On the other hand, because the index face of CD is set to towards optical pickup when the reflected light of laser has than the low power of predetermined power, main control part 7 begins to form image on the index face of CD.More particularly, optical pickup is moved to the precalculated position of opening entry image, on the basis of serial data, begin irradiating laser then, thereby on the index face of CD, form image (s15) from this position.
After the end image formed, main control part 7 made display part 4 indicator gauges be shown in the content (s16) of the image that has formed on the index face of CD.Processing is finished like this.That is to say, adopt image to form program in the optical recording apparatus with processor and optical pickup, described optical pickup is used for by having by the substrate of the thickness a pair of first type surface separated from one another of substrate and the CD recorded information that places the record surface between the first type surface to constitute.This program is that processor is executable, is used to make optical recording apparatus to carry out the method that may further comprise the steps: one of record surface and first type surface are specified as the target record face; Designated when record surface, move when making luminous point focus on the record surface thereby make object lens in range of tolerable variance, center on first basic point, the actuator of optical pickup is carried out servocontrol; And designated when first type surface, thereby make object lens in range of tolerable variance, move object lens luminous point is being focused on so that during recorded information, this actuator is carried out servocontrol on first type surface on the first type surface around second basic point.
Source, laser apparatus is changed on the index face of CD focuses on so that form above-mentioned hard-core image.For example, specifically, when the substrate surface on the side that with preset width special coating is applied to the CD index face along periphery, also can be by so that laser focusing be formed image on the mode irradiating laser in the zone of application of paint comes substrate surface on the side in the index face of CD.
Simultaneously, pass through object lens 114, quarter wave plate 113 and collimation lens 112 once more by three laser beam of CD D reflection.Laser beam is passed through cylindrical lens 115 by polarization beam splitter 111 with the right angle folded light beam and before incident light receiving element 108.
Light receiving signal R by light receiving element 108 receptions
VAmplify (with reference to figure 1) by RF amplifier 12 and provide it to servo circuit 13 etc. then.Light receiving element 108 receives main beam and two side beams in fact respectively.The surveyed area that is used to receive main beam in the light receiving element 108 is divided into four parts, and is identified for the light-receiving intensity of the optical imagery that passes through main beam of each surveyed area.For this reason, light receiving signal Rv is the common name of expression light-receiving intensity.
To be applied to the two ends of focusing coil from the focus signal Fc (with reference to figure 1) of servo circuit 13.Therefore, control the position of object lens, i.e. distance between optical disc surface and the object lens 114 with respect to optical axis direction by the voltage of focus signal Fc.
Similarly, will be applied to the two ends of tracking coil, so that limit radially the irradiation position of laser beam with respect to CD D by the voltage of tracking signal Tr from the tracking signal Tr of servo circuit 13.
In the optical pickup of invention shown in Figure 7, provide light source 102 to be used to produce laser.Object lens 114 are assembled laser and are formed luminous point, are used to shine by substrate form and have by the thickness of this substrate a pair of first type surface separated from one another and place the CD D of the record surface between the first type surface.Focus actuator 121 is provided, is used for that the thickness direction along CD D moves object lens 114 in total moving range, so that luminous point is focused on one of record surface and first type surface.Total moving range of object lens be set to be equal to or greater than range of tolerable variance and additional range and.Range of tolerable variance is set so that even be constant distance when the surface level of CD D makes object lens 114 can keep the distance between object lens 114 and the record surface when thickness direction changes.By divided by the absolute index of refraction of the substrate of CD additional range being set by the first type surface of CD D and the gap between the record surface.
According to the present invention, can obtain following effect.
(1) adopts optical pickup of the present invention, consider that the movement of panel surface is recorded in data On the recording surface of CD, and recording surface side and the index face side of CD are being put upside down the state of setting, also Can adopt this optical pickup to form the special coating of color to CD in application when with Ear Mucosa Treated by He Ne Laser Irradiation Index face on form required image.
(2) can be with Laser Focusing on the recording surface of the movement of CD internal layer, and total energy will swash Light focuses on the front surface of movement of CD.
(3) when the user specify from the importation one of from zone that two different basic points extend the time, The focus servo for focus servo mechanism is carried out in the zone that control section arranges appointment, so that optics Pick-up head 10 can be carried out focusing in the zone that arranges under the control of focus servo mechanism.
(4) be applied in the record of index face at the special coating that when with Ear Mucosa Treated by He Ne Laser Irradiation, will form color In the situation of type CD, can be set to towards optical pickup data record by recording surface In recording surface. In addition, be set to come shape on index face towards optical pickup by index face Become image.
Claims (11)
1. optical pickup that is used to shine CD, this CD has substrate surface as its first surface, as the labeled surface of its second surface and the record surface between substrate surface and the labeled surface, this CD has a thickness between substrate surface and labeled surface, described optical pickup comprises:
Light source is used to produce laser;
Object lens are used for aggregation laser, to form the luminous point of irradiation CD; With
Actuator is used for the thickness direction mobile object lens in total mobile range along CD, so that luminous point is focused on record surface or the labeled surface, wherein
Total moving range of object lens be set to be equal to or greater than range of tolerable variance and additional range and, range of tolerable variance is set to object lens be moved so that keep constant distance between object lens and the record surface when the surface level of CD when thickness direction changes, by divided by the absolute index of refraction of the substrate of CD this additional range being set by the substrate surface of CD and the gap between the record surface;
Utilize the focus servo control device to control actuator, to remain the distance between object lens and the record surface constant.
2. equipment that is used at CD identifying recording layer and visual image, described CD has substrate surface, the labeled surface opposite with substrate surface at least, be inserted in the record surface between substrate surface and the labeled surface and be arranged on reflection horizon below the record surface, described record surface is subjected to the irradiation by the laser of substrate surface, with record and reproduction data, described equipment comprises:
Optical pickup with object lens is used for by the object lens irradiating laser to CD;
Feeding device is used for the radial direction mobile optical pick-up head along CD;
Spindle drive motor is used for rotation and drives CD; With
Principal computer is used for the record of control data and visual image, wherein
When being recorded in data on the record surface, the substrate surface of CD is towards optical pickup;
When being recorded in visual image on the labeled surface, the labeled surface of CD is towards optical pickup; And
Distance between optical lens and the CD under first kind of situation of the record surface identifying recording layer of CD and under second kind of situation of record visual image on the labeled surface, has difference.
3. equipment according to claim 2, also comprise focusing, be used for by object lens laser focusing at CD, so that the gain of focusing is being changed under first kind of situation of the record surface identifying recording layer of CD and between second kind of situation of record visual image on the labeled surface.
4. equipment according to claim 2, wherein CD is coated with the coating that is used to form visual image.
5. equipment according to claim 2, wherein spindle drive motor drives CD with the Constant Angular Velocity rotation.
6. equipment according to claim 2, wherein spindle drive motor drives CD with the constant linear velocity rotation.
7. equipment according to claim 2, wherein spindle drive motor has frequency generator, and output is used to detect the signal of the anglec of rotation or the rotational speed of CD.
8. equipment according to claim 2, wherein, with laser radiation to the rotation CD on during, optical pickup radially wobbles along CD.
9. equipment according to claim 2, wherein, during irradiating laser, each period of change of optical pickup along the radially wobbling of CD, so that is applied to the identical circumference of repeatedly counting with laser with predetermined amplitude.
10. equipment according to claim 2, wherein, when CD was set, principal computer checked whether the labeled surface of CD is set to towards optical pickup.
11. one kind is used for the optical disk recording device of laser radiation to the CD, described CD by have substrate surface, the labeled surface opposite with substrate surface and be inserted in substrate surface and labeled surface between the substrate of record surface constitute, described optical disk recording device comprises:
Light source is used to produce laser;
Object lens, the thickness direction along the substrate of CD in total mobile range moves, and aggregation laser, to be formed for shining the luminous point of CD; And
Actuator can move object lens around first basic point, is used for luminous point is focused on record surface, and moves object lens around second basic point, is used for luminous point is focused on labeled surface; Wherein
Total moving range be set to be equal to or greater than range of tolerable variance and additional range and, this range of tolerable variance is set to object lens be moved so that keep constant distance between object lens and the record surface when the surface level of CD when thickness direction changes, in a side opposite with CD, additional range is added on the range of tolerable variance, and, make actuator between first basic point and second basic point, change object lens by divided by the absolute index of refraction of the substrate of CD additional range being set by the first type surface of CD and the gap between the record surface;
Utilize the focus servo control device to control actuator, to remain the distance between object lens and the record surface constant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002213649 | 2002-07-23 | ||
| JP2002213649A JP2004055076A (en) | 2002-07-23 | 2002-07-23 | Optical pickup and optical disk recorder |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03133050.9A Division CN1271613C (en) | 2002-07-23 | 2003-07-23 | Optical pick-up head with double-focal-length |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1822144A CN1822144A (en) | 2006-08-23 |
| CN100397510C true CN100397510C (en) | 2008-06-25 |
Family
ID=29997223
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03133050.9A Expired - Fee Related CN1271613C (en) | 2002-07-23 | 2003-07-23 | Optical pick-up head with double-focal-length |
| CNB2006100063222A Expired - Fee Related CN100397510C (en) | 2002-07-23 | 2003-07-23 | Optical pickup with dual focal length |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03133050.9A Expired - Fee Related CN1271613C (en) | 2002-07-23 | 2003-07-23 | Optical pick-up head with double-focal-length |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US20040136291A1 (en) |
| EP (1) | EP1385154B1 (en) |
| JP (1) | JP2004055076A (en) |
| CN (2) | CN1271613C (en) |
| DE (1) | DE60331506D1 (en) |
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| US20050047287A1 (en) * | 2003-08-29 | 2005-03-03 | Hanks Darwin Mitchel | Focus control |
| US20050047286A1 (en) * | 2003-08-29 | 2005-03-03 | Hanks Darwin Mitchel | Focus error signal generation |
| US7315493B2 (en) * | 2004-01-30 | 2008-01-01 | Hewlett-Packard Development Company, L.P. | Apparatus and method for calibrating a laser imagible apparatus |
| JP2005267795A (en) * | 2004-03-19 | 2005-09-29 | Sony Corp | Optical pickup, and recording and reproducing apparatus of optical recording medium |
| WO2006003574A2 (en) * | 2004-06-28 | 2006-01-12 | Koninklijke Philips Electronics N.V. | Method and apparatus for recording data in an optical record |
| JP2006031893A (en) * | 2004-07-21 | 2006-02-02 | Matsushita Electric Ind Co Ltd | Optical disk apparatus |
| US7809259B2 (en) * | 2004-07-26 | 2010-10-05 | Panasonic Corporation | Optical disk and optical disk device |
| KR100633202B1 (en) * | 2005-03-23 | 2006-10-12 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Method for controlling focus servo in optical disc device |
| CN101223589B (en) * | 2005-05-23 | 2011-05-25 | 瑞萨电子株式会社 | Apparatus of compact disc |
| WO2006129231A1 (en) * | 2005-06-03 | 2006-12-07 | Arima Devices Corporation | Objective lens system for writing labels on an optical record carrier |
| US7646685B2 (en) * | 2005-06-11 | 2010-01-12 | Hewlett-Packard Development Company, L.P. | Tracing discrete spiral path relative to optical disc |
| WO2006134531A2 (en) * | 2005-06-15 | 2006-12-21 | Koninklijke Philips Electronics N.V. | Method of writing on an optical recording medium, optical recording medium, and method of manufacturing an optical recording medium |
| EP1742219B1 (en) * | 2005-06-30 | 2012-06-13 | Yamaha Corporation | Method and apparatus for forming visible images on optical disk by laser beam |
| US7679633B2 (en) * | 2005-09-29 | 2010-03-16 | Hewlett-Packard Development Company, L.P. | Facilitating focusing of a multi-function digital media drive |
| US7492385B2 (en) * | 2006-02-16 | 2009-02-17 | Hewlett-Packard Development Company, L.P. | Labeling an optical medium having a prelabeled or unlabelable region |
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| JP2008137297A (en) * | 2006-12-01 | 2008-06-19 | Sony Corp | Printing method, printer, and recording medium driver |
| JP4367483B2 (en) * | 2006-12-25 | 2009-11-18 | ヤマハ株式会社 | Optical disc drawing apparatus, host computer, and optical disc drawing method |
| US20090116356A1 (en) * | 2007-08-07 | 2009-05-07 | Lite-On It Corporation | Method for recording a visually detectable pattern on an optical record carrier, apparatus for recording a visually detectable pattern on a record carrier and instruction to be executed by the apparatus |
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- 2003-07-22 US US10/624,803 patent/US20040136291A1/en not_active Abandoned
- 2003-07-22 EP EP03016719A patent/EP1385154B1/en not_active Expired - Lifetime
- 2003-07-23 CN CN03133050.9A patent/CN1271613C/en not_active Expired - Fee Related
- 2003-07-23 CN CNB2006100063222A patent/CN100397510C/en not_active Expired - Fee Related
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2010
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1271613C (en) | 2006-08-23 |
| JP2004055076A (en) | 2004-02-19 |
| CN1822144A (en) | 2006-08-23 |
| EP1385154B1 (en) | 2010-03-03 |
| EP1385154A2 (en) | 2004-01-28 |
| CN1479285A (en) | 2004-03-03 |
| US20040136291A1 (en) | 2004-07-15 |
| US20100188942A1 (en) | 2010-07-29 |
| EP1385154A3 (en) | 2005-11-02 |
| DE60331506D1 (en) | 2010-04-15 |
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